Manual Raytheon NAV398GPS LORAN (page 18 of 74) (English)

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If the Differential Beacon Receiver is connected and tracking the beacon

signal “DGPS” is indicated in the message window. The latitude/longitude

readouts will include the differential corrections for greater accuracy.

When the Loran-C mode is selected, the “LORAN” characters will be

illuminated along in the message window of the display and the L/L position

and ship’s course and speed data is then Loran-C derived.

When both GPS and Loran sensors are connected, the NAV unit always

selects the sensor that was “last used” when the power is turned ON. If its

the very first time the unit is used and both sensors are connected, the GPS

is always selected as the priority system.

3.4 Initializing Sensors

Although the

R~YNAV

508 Loran and Raystar 108 GPS sensors are capable

of finding the latitude/longitude position once they have been powered up,

at the very first power-up following installation or after a Master Reset, the

position finding process may take up to 30 minutes or more. This startup time

can be reduced to some degree by entering initialization information into the

sensor’s memory. The process for initializing each sensor appears in the

following paragraphs.

The very first time the NAV

unit is operated, or following

a Master reset of the unit, the

screen will prompt you to en-

ter your “estimated latitude”

coordinate followed by entry

of the “estimated longitude”

coordinate., Once you’ve en-

tered this information into the

sensors via the

NAV 398, the

sensors should be able to find

your location more rapidly.

The loran sensor only needs the initial L/L input and should typically lock-in

in 3 to 5 minutes. The GPS sensor also needs the initial L/L input and prefers

to have the Date and Time and Antenna height information as well for quick

acquisition and tracking.

OPERATION 3-5

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Raytheon NAV398GPS LORAN Manual

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